The default behavior to unhide a column is to double click the column’s border. When you just want to drag and resize the hidden columns, you can do it by handling the ResizingCols event.
In the following code example resizing hidden columns in gridcontrol is done by using the gridControl1_ResizingColumns event.
Note: When you want Excel-like behavior to show the vertical split when the columns are hidden, you can achieve this by implementing your own mouse controller.
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